The Sanyo ICR-FP600D digital voice recorder is an excellent choice for business professionals, college students, reporters, conference attendees, and music enthusiasts; providing uncompromising audio recording quality in a sleek, compact design. For work, for school, or for play, it combines important functionality in an easy-to-carry, user-friendly design. It offers MP3 recording and virtually unlimited recording time using removable SD memory cards (1GB SD card included). High Quality MP3 Recording Format Up to 544 Hours of Recording (with optional 8GB SDHC card)29 Hour Battery Life* (“AAA” alkaline battery) Built-in Microphone and External Stereo Microphone Input Playback Speed Control + 200% - 50% (MP3 files) Voice Activated System (VAS) Technology Preset Equalizers (EQ) Recording from External Sources Timer Recording Features Easy File Management